Listar Ciencias básicas por título
Mostrando ítems 2022-2041 de 3121
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Observed Changes (1970-1999) in Extreme Hydroclimatic Events in Central America
(2018-04-20)Previous studies have shown that most of Central America has been experiencing warming trends during the last 30-50 years, while precipitation annual totals have not changed much. Warming alone can exacerbate the effects ... -
Obstáculos y oportunidades para el “progreso”. Las representaciones de la naturaleza costarricense como “recurso natural” y los condicionantes de su apropiación y aprovechamiento: el caso de los exploradores extranjeros (1850-1905)
(Buenos Aires: Editorial FEPAI, 2007, 2007)Los estudios históricos de la naturaleza y su relación con las sociedades son esfuerzos que permiten explicar la situación del presente en relación con el manejo de los recursos naturales. En este estudio se analiza una ... -
Obtención de conjuntos aproximados mediante algoritmos genéticos
(Tesis para optar al grado de Magister Scientiae en Computación. ITCR, Cartago, 1999., 1999)En términos generales, la teoría de conjuntos aproximados, propuesta por Pawlak, consiste en explorar las particiones asociadas a las relaciones de equivalencia generadas por cada subconjunto de los atributos observados, ... -
Occurrence of pharmaceuticals, hazard assessment and ecotoxicological evaluation of wastewater treatment plants in Costa Rica
(2020)The continuous release of pharmaceuticals from WWTP effluents to freshwater is a matter of concern, due to their potential effects on non-target organisms. The occurrence of pharmaceuticals in WWTPs and their associated ... -
Occurrence of pharmaceuticals, hazard assessment and ecotoxicological evaluation of wastewater treatment plants in Costa Rica
(2021)A monitoring study was carried out in three agriculturally influenced microcatchments in Costa Rica during 2012–2014, for pesticides and water quality parameters. A total of 42 pesticides were analyzed, detecting the ... -
Occurrence of the tripodfish Bathypterois ventralis (Aulopiformes: Ipnopidae) in the Pacific coast of Costa Rica
(2015-05)Between 1990 and 1992, 2 adult specimens of the ventrad spiderfish, Bathypterois ventralis Garman 1899, were collected at depths between 637 and 880 m off the Pacific coast of Costa Rica. These specimens constitute the ... -
Ocean Evaporation and Precipitation
(2012)In view of the threat of global climate change , the proper understanding of the intensity of the hydrological cycle and of its development over time is one of the most important challenges of the century, at least in the ... -
Oceanic and terrestrial sources of continental precipitation
(American Geophysical Union 50:1-41, 2012-11-08)The most important sources of atmospheric moisture at the global scale are herein identified, both oceanic and terrestrial, and a characterization is made of how continental regions are influenced by water from different ... -
Ocurrencia de ciclones tropicales en el Mar Caribe y sus impactos sobre Centroamérica
(2010-01)Se definieron en este trabajo los años de alto o bajo impacto en Costa Rica por el paso de Ciclones Tropicales en el Caribe para 1948-2007. Costa Rica posee una base rica en información sobre desastres naturales que afectaron ... -
On asymptotic expansions of twisted products
(1989-12)The series development of the quantum-mechanical twisted product is studied. The series is shown to make sense as a moment asymptotic expansion of the integral formula for the twisted product, either pointwise or in the ... -
On Maxillaria bomboizensis and Camaridium carinatum (Orchidaceae)
(2007-06-01)Maxillaria bomboizensis is synonymized under Camaridium carinatum. Two previously published combinations based on Maxillaria bomboizensis (Camaridium bomboizense and Sauvetrea bomboizensis) are invalid. A complete synonymy ... -
On summability of distributions and spectral geometry
(1998-01)Modulo the moment asymptotic expansion, the Cesàro and parametric behaviours of distributions at infinity are equivalent. On the strength of this result, we construct the asymptotic analysis for spectral densities arising ... -
On the approximation of a virtual coarse space for domain decomposition methods in two dimensions
(2018)A new extension operator for a virtual coarse space is presented which can be used in domain decomposition methods for nodal elliptic problems in two dimensions. In particular, a two-level overlapping Schwarz algorithm is ... -
On the Colmez conjecture for non-abelian CM fields
(2018-02-08)The Colmez conjecture relates the Faltings height of an abelian variety with complex multiplication by the ring of integers of a CM field E to logarithmic derivatives of Artin L-functions at s=0. In this paper, we prove ... -
On the Identity of Trichocentrum orthoplectron (Orchidaceae: Oncidiinae), with a new species from Bolivia
(2018)The species traditionally included under the synonymy of Trichocentrum albococcineum are re-evaluated, and T. orthoplectron is reinstated as a separate species. A new species of Trichocentrum from Bolivia, T. moreniorum, ... -
On the kinematics of the last Wigner particle
(2019)Wigner's particle classification provides for "continuous spin" representations of the Poincaré group, corresponding to a class of (as yet unobserved) massless particles. Rather than building their induced realizations by ... -
On the meaning of Cypripedium × grande (Orchidaceae) and its taxonomic history, with a new name for the nothospecies occurring in Costa Rica and Panama
(2018-12-11)The taxonomic history of Phragmipedium × grande is traced to show that its current treatment as the cross between P. longifolium and P. humboldtii is untenable. According to our interpretation of the holotype and other ... -
On the one dimensional spectral Heat content for stable processes
(2016-09)This paper provides the second term in the small time asymptotic expansion of the spectral heat content of a rotationally invariant α-stable process, 0 < α ≤ 2, for the bounded interval (a, b). The small time behavior ... -
On the rainfall distribution with altitude over Costa Rica.
(Revista Geofísica 44, 57-72, 1996, 1996-01)Se estudia la distribución de la precipitación vertical en Costa Rica, a lo largo de un perfil topográfico que cruza el pais del Pacífico hasta la costa del mar Caribe. El perfil en montaña, cuyo pico más alto llega a los ... -
On the Ramanujan–Lodge harmonic number expansion
(2015-01-15)The aim of this paper is to extend and refine the Ramanujan–Lodge harmonic number expansion into negative powers of a triangular number. We construct a faster asymptotic series and some new sharp inequalities for the ...